In vitro catabolism of quercetin by human fecal bacteria and the antioxidant capacity of its catabolites

Figures & data

Fig. 1 (a) Catabolites of C. perfringens fermenting quercetin, with HPLC analysis. S1 and S2 individually refer to the control and sample. (b) Catabolites of B. fragilis fermenting quercetin, with HPLC analysis. S1 and S2 individually refer to the control and sample.

Fig. 2 Mass spectrum of the main compound.

Fig. 3 The removal rate of DPPH free radicals by quercetin and its MSCs from seven bacterial species in broths. The quercetin in BHI and MRS individually refers to the removal rate of DPPH free radicals by BHI and MRS media supplemented with quercetin and incubated for 24 h but without being inoculated with the bacteria.

Fig. 4 The removal rate of OH free radicals by quercetin and its MSCs from seven bacterial species. The quercetin in BHI and MRS individually refers to the removal rate of OH free radicals by BHI and MRS media supplemented with quercetin and incubated for 24 h but without being inoculated with the bacteria.

Fig. 5 Proposed metabolic pathway of quercetin by rat colonic microflora. The totally squared metabolites are not detected. From Serra et al. (9).

Serra A, Macia A, Romero M, Reguant J, Ortega N, Motilva M. Metabolic pathways of the colonic metabolism of flavonoids (flavonols, flavones and flavanones) and phenolic acids. Food Chem. 2012; 130: 383–93.

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